>>> now called the city of lights, but paris may go dark. banning museums and churches in the eiffel tower they want the lights off from 1:00 a.m. to 7:00 a.m. it is part of environmental regulations and the businesses say it could hurt their bottom line. but too bad. thanks for watching. >> thanks, megan. serious chemical weapons are mixed and ready to kill. that's the word from senior u.s. officials today. there are new warnings for the united states, and details on the deadly nerve agent which can kill a person with one drop. and then there is the mysterious john mcafee, the software guy. he is back behind bars after being on the run. >>> a picture. -- >> quite a picture. you probably know the name from millions of computers mcafee and now he is facing serious allegations about a murder. and people could be sifting through your internet history. in fact, they could be doing it now and you wouldn't have a clue. it is a new form of cyber spying. it is all ahead unless breaking news changes everything on "studio b." first from fox at 3:00 in